1N4743E3/TR13

Overview

The Microchip Technology 1N4743E3/TR13 is a silicon 1.0-watt Zener diode in the 1N4728AP through 1N4764AP series, housed in a plastic DO-41 (DO-204AL) axial-lead package. It provides voltage regulation with a nominal Zener voltage of 13V and a standard tolerance of ±5%. The device operates within a temperature range of -65°C to +150°C and features RoHS-compliant annealed matte-tin plating. The 'TR' suffix indicates tape and reel packaging per EIA-296 standards.

Feature Summary

• Provides stable voltage regulation across a broad operating current and temperature range
• Utilizes void-free transfer molded thermosetting epoxy body meeting UL94V-0 flammability ratings
• Features flexible axial-lead mounting terminals for standard PCB integration
• Moisture classified as Level 1 per IPC/JEDEC J-STD-020B without requiring dry pack storage

Applications

• General purpose voltage regulation circuits
• Power supply reference voltage generation
• Overvoltage protection stages
• Clamping applications in electronic systems

Procurement Notes

Verify that the specific part number matches the required tolerance and packaging configuration. Confirm RoHS compliance status and lead material specifications against project requirements. Ensure the tape and reel quantity aligns with manufacturing needs. Check for any military screening prefixes if higher reliability levels are necessary for the intended application environment.

Selection Notes

Select this component when a 1-watt power dissipation rating and axial-lead form factor are required. Consider the 13V nominal voltage and ±5% tolerance for precise regulation needs. Evaluate thermal derating curves for high-temperature environments. Compare against glass-body options if lower thermal resistance or hermetic sealing is not critical for the design.

Part Context

This device belongs to the widely used 1N47xx series of Zener diodes manufactured by Microsemi's Scottsdale Division. The series offers an extensive voltage selection from 3.3V to 100V. The plastic encapsulated version provides lower thermal resistance compared to glass-body alternatives while maintaining JEDEC registration for interchangeability with industry-standard parts.

Replacement Considerations

Surface mount equivalents such as SMAJ4743A or MLL4743A are available from the same manufacturer family. Other manufacturers producing JEDEC registered 1N4743A devices may serve as functional substitutes provided electrical parameters and package dimensions are compatible.